13809691 has 4 divisors (see below), whose sum is σ = 15782512. Its totient is φ = 11836872.

The previous prime is 13809673. The next prime is 13809707. The reversal of 13809691 is 19690831.

13809691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19690831 = 67 ⋅293893.

It is a cyclic number.

It is not a de Polignac number, because 13809691 - 2⁹ = 13809179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13809691.

It is not an unprimeable number, because it can be changed into a prime (13809611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986400 + ... + 986413.

It is an arithmetic number, because the mean of its divisors is an integer number (3945628).

Almost surely, 2^13809691 is an apocalyptic number.

13809691 is a deficient number, since it is larger than the sum of its proper divisors (1972821).

13809691 is an equidigital number, since it uses as much as digits as its factorization.

13809691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972820.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 13809691 is about 3716.1392600386. The cubic root of 13809691 is about 239.9171647000.

The spelling of 13809691 in words is "thirteen million, eight hundred nine thousand, six hundred ninety-one".